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/**
 * Copyright (c) 2013-2014 Netflix, Inc.  All rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.netflix.msl.msg;

/**
 * A message debug context is used to provide debugging callbacks to
 * {@link com.netflix.msl.msg.MslControl}.
 * 
 * @author Wesley Miaw 
 */
public interface MessageDebugContext {
    /**
     * Called just prior to sending a message with the message header or error
     * header that will be sent. An error may occur preventing successful
     * transmission of the header after this method is called.
     * 
     * @param header message header or error header. 
     */
    public void sentHeader(final Header header);
    
    /**
     * Called just after receiving a message, before performing additional
     * validation, with the message header or error header.
     * 
     * @param header message header or error header.
     */
    public void receivedHeader(final Header header);
}